Gasification of waste to create energy is the most common technology type for diverting waste from landfill and converting it into energy.
Gasification covers a large range of technologies for thermal treatment of waste, including: fixed bed, moving bed and fluidised bed. These types of solutions all have sub types and are in typical use for larger volumes of waste (over 80,000 tons per annum).
Gasification may combine plasma arc technology (also known as ‘plasma assisted gasification’) with a pre-burning phase, or focus solely on plasma arc or use other high temperature methods (e.g. Pyrolysis).
In the Gasification process, waste is heated to high temperatures to produce a gas or Syngas. In a typical set-up Municipal Solid Waste (MSW) is delivered to a facility and, after sorting to extract recyclables, is subjected to high temperatures and reduced air on the gasification platform. This creates a chemical reaction that creates synthetic gas (Syngas).
Syngas is then combusted and processed through an established energy recovery system, followed by a state-of-the-art emissions control system.
Gasification has benefits over older thermal technologies such as moving grate combustion in that it does not produce the same emissions (low to no oxygen is used), has higher thermal efficiency and it also creates useful products such as Syngas.